Both strip mining and quarrying______ exposure to the earth’s surface.

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问题 Both strip mining and quarrying______ exposure to the earth’s surface.

选项 A、maintain
B、maintaining
C、maintains
D、is maintained

答案A

解析 The compound subject both strip mining and quarrying needs a plural verb: maintain.

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托福（TOEFL）

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Both strip mining and quarrying______ exposure to the earth’s surface.

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